The navigation jumps up when going back to startpage

The navigation jumps up when going back to startpage

Hi all,

I hope you can help me with my issue. When I click on a link from the startpage and later go back, the Nava jumps up over the intro text in Chrome and Safari.

I am new to jQuery and would appreciate any help. Been dugging for hours i cant find a solution.

Added a screenshot. You must minimize the browser to test/see the problem.

Site: http://aixnow.cypoint.se